The MGN60890 is a 3-pole C60N miniature circuit-breaker from the Multi9 range, rated 3 A at 50 °C per EN/IEC 60947-2. The C curve means magnetic tripping occurs between 5 and 10 times In — here the magnetic limit is set at 8.5 x In ±20 %, so it clears moderate inrush without nuisance trips on lighting or small motor loads. For a 3 A feeder, that headroom is generous — you can coordinate with upstream devices without worrying about cascading failure. The difference matters: 60947-2 allows higher Icu ratings and includes isolation suitability (marked on the device).
The 54 mm width occupies 6 modules of 9 mm pitch — standard for a 3-pole MCB. IP20 finger-safe protection is fine for enclosed panels; if the breaker is near the gland plate or exposed during maintenance, the IP20 rating means no ingress protection against water or dust — keep it inside the enclosure.